Electrolytic rectifier



.tassium phosphate and citric acid. I

Patented July 28, 1931 PATENT omet:

FRANK G. IBEEI'EM, OF PHILADELPHIA; PENNSYLVANIA ELECTROLYTIG BEGTIEIEB Application led March Tl, 1926. Serial No. 91,653.

My invention relates to electrolytic rectiers, and its object is to provide an electro- 4lyte for such rectiers, and especially for those in which metallic aluminum is employ'ed as one of the electrodes, which shall prolong the life of the electrode, reduce the heating and increase the output of the rectiier as compared with electrolytes heretofore employed.

The single ligure of the accompanying drawing illustrates a conventional electrolytic cell.

In the drawing 1 is an electrode of metal lic aluminum. For the electrode 2 a nonlm forming metal may be used. An example is lead antimony alloy. l 3 is the electrolyte and 4 the jar.

In the preferred form of my electrolyte I use an aqueous solution or admixture of mono-ammonium phosphate, dibasic that very satisfactory results `are obtained when these substances are used in the fllowing proportions: 3 parts by weight of mono-ammonium phosphate, 6 parts by weight of dibasic potassium phosphate, 16`

parts by weight of citric acid, wei ht of water.

owever, considerable variation.A vmay be made in the proportions in which the three substances cited above are used, and excellent results may be obtained by using less of the citric acid and by varying the relation between the ammonium andthe potassium phosphates. YI do not, therefore, wish my 7 5 partsby invention 'to be llimited to the exact proportionscited above. A

Citi-ic acid is an example of those organic acids which form soluble compounds with aluminum 'when subjected to current Vin an electrolytic cell..

I claim:

r comprising a fluid' admixture of water,

u iia1:- An electrolyte for mi imlytie mono-ammonium phosphate, di-basic potassium hosphate and citric acid.

2. f n elecrolyte for an electrolytic rectifier, comprising an admixture of water, and one part of mono-ammonium phosphate to approximately two parts of di-basic potassium phosphate and at least one part of citric acid.

FRAN K G. BEETEM. 

